James Alexander Corp.: Radius seal for plastic ampoules

The specially-engineered radius seal provides a stylish, finished look
to the product. The glass-free ampoule is comprised of a one-piece
molded polyethylene or polypropylene unit that remains intact and
sealed until activated by the user. Activation is accomplished
instantaneously with a gentle squeeze of the package. This breaks an
inner plastic membrane that seals in the contents prior to use.
Another gentle squeeze then dispenses the product.